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import { equal } from 'https://deno.land/x/testing/mod.ts';import { red, green, white, gray, bold, bgBlue } from 'https://deno.land/x/std/colors/mod.ts';import diff, { DiffType, DiffResult } from 'https://denopkg.com/bokuweb/wu-diff-js@0.1.7/lib/index.ts';import { format } from './format.ts';
const CAN_NOT_DISPLAY = '[Cannot display]';
function createStr(v: unknown): string {  try {    return format(v);  } catch (e) {    return red(CAN_NOT_DISPLAY);  }}
function createColor(diffType: DiffType) {  switch (diffType) {    case 'added':      return (s: string) => green(bold(s));    case 'removed':      return (s: string) => red(bold(s));    default:      return white;  }}
function createSign(diffType: DiffType) {  switch (diffType) {    case 'added':      return '+   ';    case 'removed':      return '-   ';    default:      return '    ';  }}
function buildMessage(diffResult: ReadonlyArray<DiffResult<string>>) {  const messages = [];  messages.push('');  messages.push('');  messages.push(`    ${gray(bold('[Diff]'))} ${green(bold('Added'))} / ${red(bold('Removed'))}`);  messages.push('');  messages.push('');  diffResult.forEach((result: DiffResult<string>) => {    const c = createColor(result.type);    messages.push(c(`${createSign(result.type)}${result.value}`));  });  messages.push('');
  return messages;}
export function assertEqual(actual: unknown, expected: unknown) {  if (equal(actual, expected)) {    return;  }  let message = '';  const actualString = createStr(actual);  const expectedString = createStr(expected);  try {    const diffResult = diff(actualString.split('\n'), expectedString.split('\n'));    message = buildMessage(diffResult).join('\n');  } catch (e) {    message = `\n${red(CAN_NOT_DISPLAY)} + \n\n`;  }  throw new Error(message);}